Furnace



(No Model.) 2 Sheets-Sheet 1.

E. S. ROGERS.

- FURNACE. No. 592,065. Patented Oct. 19,1897.

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(No Model.) 2 Sh'eets-Sheet"2.

E. S. ROGERS.

FURNACE.

Patented Oct. 19, 1897.

WJiE'ZZeriSfiyerS ma uonaus PErzws :01 Pumaujma, wgmurnom 0 clembodying my invention is preferably con- A TATES ELBERT SEVERE ROGERS, OF KNOXVILLE, TENNESSEE.

'FuRNAcE.

SPECIFICATION forming part of Letters retentive; 592,065, dated October 19, 1897,

Applioationfiled August 12, 1896.

To all whom it mag concern.- H

Be it known that I, ELBERT SEVERE Roe- ERS, a citizen of the United States, residing at Knoxville, in the county of Knox and'State of Tennessee, have invented a new and'useful Furnace, 'of which the following is a specification. .7 t

My invention relates to heating devices, and particularly toaheatingand-ventilating furnace adapted for use in connection with private and public buildings for conveying pure heatedair to the various apartments thereof; and the'object in view is to provide a simple and efficient construction and arrangement of radiating and deflecting surfaces so disposed as to insure the heating of a current of air to a high temperature without the use of an excessive quantity of fuel by detaining said air in contact with the radiating-sun faces until the major portion of heat has been extracted from the products of combustion, and in producing a secondary combustion of gases and smoke which escapecombustion" in the fire-box.

Further objects and advantages of this in vention will appear'in the following description, and the novel features thereof will be particularly pointed out in the appended claim. I

In the drawings, Figure -1 isa perspective View, partly broken away,'of a heating device embodying my invention. Fig.2 is' a longitudinal section of the same. Fig, 3 is a transverse section taken through the initial heating-chamber in the plane indicated by the line 3 3 of Fig. 2 with the rear wall thereof partly broken away to show the heatingdrums in the secondary heating-chamber. Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

The outer shell or casing ofthe furnace structed of masonry with the topl thereof fitted with a non-conducting cover, such as sheet metal 1, anda superposedlayer of sand 2, or its equivalent. 'Th'e fir'e-box-ti, which is located at the front of the shell or casing, is preferably constructed of metal with its rear wall 4: perforated'to form an indirectdraft opening 5, and with its arched top 6 perforated to form a direct-draft opening 7 Serial No. 602,540. (No model.)

Beneath the grate 9 of the pit and fire-box are provided with suitable doors'll and12, arranged in'a frontc'asting or face-plate 13, which is arranged in contact with the front wall of the shellor' casing. The smoke fine or stack 8 is fitted, at a point a short distance above the arched top of the fire-box, with a damper 14:, provided with an operatingflrod or'handle 15, which projects through said casting or face-plate;

Erected in rear of, and preferably in contact with, the rear wall or sideof the firebox is a transverse masonry partition 16, which thus separates the front portion of the shell or casing from the rear portion, the depth of said front portion or compartment which in the further description of my invention I Will term the initial heating-chamber, be-

ing equal to that of the fire-box. This initial'heating-chamber does not extend to the top of the shell orcasing, but is limited by a horizontal plate 17, located above the plane of the top of-the fire-box to form an intervening space, wherebythe portions of the initial heating-chamber upon opposite sides of the fire-box ar'ein open communication, and said plate is perforated in 'alinement with the top offthe fire-box for the reception of the smoke flue 'or stack 8. In. the front wall of the shell or casing, and hence of the initial heatingchamber, and contiguous to thefioor of the latter, are formed the air inlet and supply openin'g's 18," and formed in the transverse partition-wall, which forms the rear wall of said initial heating-chamber, are outlet-openings 19,'by which communication is established between the initial heating-chamber and the portion of g the interiorof the shell or casing which is in rear of the partition-wall 16, said rear portion of the interior of the shell or casing being termed hereinafter the secondary heating-chamber.

The secondaryheating chamber of the furnace embodying my invention contains a plurality of heating-drums which are interiorly in communication with the fire-box and are designed to form a connected series of conductors for the products of combustion when the direct draft is cut off through the smoke fiue or stack 8 by the closing of the damper 14:. For this purpose said drums, which are preferably disposed in horizontal planes and are connected by intermediate pipes, are located in tiers, with the drums of the lowermost tier in communication with the indirect-draft openin 5. In practice 1 prefer to arrange a plurality of drums in each tier, and, as illustrated in the drawings, the first or lowermost tier may consist of front and rear drums 20 and 21, the former being in communication by a short pipe with the indirect-draft opening 5, and said drums being connected by intermediate horizontal pipes 22.

The plate 1'7, which forms the top of the initial heating-chamber, is extended rearwardly beyond the masonry wall or partition 16 to form a horizontal deflector 23, which terminates short of the rear wall of the shell or casing, and which may, as illustrated, terminate short of the vertical plane of the rear drum 21 of the lowermost tier. Above the plane of this deflector is arranged a second tier of heating-drums El and 25, both of which are arranged in advance of the rear edge of the deflector, whereby air escaping from the initial heating-chamber and passing to the rear, as indicated by the arrows in Fig. 2, is forced to come in contact with the rear drum 21 of the lowermost tier before it can rise into the space above the deflector 23 for contact with the drums of the upper tier. In other words, the deflector is so disposed as to cause the air as it passes through the furnace to come in contact successively with all of the drums, and in order to accomplish this the rearmost drum of the upper tier is arranged in advance of the rear edge of the intermediate deflecting-plate 23, and the connectingpipes 26, between the rearmost drums of the lower and upper tiers, are curved forwardly, approximately in the direction followed by the air in passing around the rear edge of the deflecting-plate. The drums of the upper tier are connected by horizontal pipes 27, and the drum 25 is preferably arranged to intersect the smoke flue or stack 8, and with only a short space intervening between the same and the top of the fire-box. The object of arranging the drum 25 directly above and close to the fire-box, with a straight vertical pipe-section connecting the same with the fire-box, is to expose the contents of the drum to the direct heat of the fire-box, whereby smoke and gaseous products of combustion, after passing successively through the conductor formed by the connected series of drums and interposed pipes, is ignited in the terminal drum 25 of the series to produce a secondary combustion which maintains the temperature of said drum at a high degree without the use of an additional supply of fuel.

Above the upper tier of drums I have arranged a second or upper deflector 28, which extends forwardly from the rear wall of the shell or casing and terminates contiguous to tial heating-chamber.

the vertical plane of the foremost druni of the upper tier. Hence after the air passing through the shell or casing reaches the drum 25 it ascends and follows the plane of the upper deflector, between the same and the top or cover of the furnace, to the distributingpipes 29.

From the foregoing description it will be seen that the air to be heated is first admitted into an initial heating-chamber in which the metal-walled fire-box is wholly ineased, and said air is retained in this chamber, exposed to the direct radiant heat of the burning fuel, until it finds its escape through the openings 19. After leaving the initial heating-chamber and entering the secondary heating-chamber the air follows the'direction of the continuous conductor consisting of the connected series of drums and pipes, which combine to form a continuous radiating-surface from the rear wall of the fire-box rearwardly to a pointnear the rear wall of the casing, and thence upwardly and forwardly to a point contiguous to and above the firebox, but separated therefrom, and from the space immediately surrounding the same, by a horizontal plate forming the top of the ini- At this point the air is exposed to the heat produced by the secondary combustion of the products of the initial combustion, due to the ignition, by the direct heat of the furnace, of the smoke and gaseous products which have passed through the continuous conductor in communication with the indirect-draft opening of the fire-box.

The radiating-drums are preferably provided with terminal removable caps 30 to facilitate cleaning, and a manhole 31 in the rear wall of the shell or casing is provided with a door 32, this opening giving access to the interior of the shell or casing, to inspect the condition of the contained apparatusand provide for the cleaning of the drums.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the spirit or sacrifiein g any of the advantages of this invention.

Having described my invention, what I claim is- A furnace having initial and secondary heating-chambers arranged in a common shell or casing and separated by an intermediate masonry wall and a metallic covering-plate forming the top of the initial heating-chamber, a metal-walled fire-box located in the initial heating-chamber out of contact with the side walls and top thereof, a connected series of heating-drums located in the secondary heating-chamber in communication at one end with an indirect-draft opening in the rear wall of the fire-box, and having a terminal drum located transversely above the covering-plate forming the top of the initial heating-chamber, said series of drums being arranged to form upper and lower horizontal tiers, a lower deflecting-plate formed as an extension of said covering-plate and extending rearwardly between said tiers of drums,

a forwardly-extending deflecting-plate projecting from the rear Wall of the secondary heating-chamber to a point near the Vertical plane of said terminal drum of the series, and a vertical dampered direct-draft flue extending from the top of the fire-box and communicating with said terminal drum of the series, whereby direct heat communicated from the fire box through said direct-draft flue is "adapted to cause a secondary combustion of gases conveyed by the series of drums to the ELBERT SEVERE ROGERS.

' W'itnesses:

W. M. MOORE, W. L. TRENT. 

